Despite all the secrecy at Apple, plenty of employees at the company are on Twitter.

Engineers, designers and even some big name executives are on the social network, though not all of them are actually worth following.

Scott Forstall, Apple's senior VP of iPhone software, has a Twitter account but has never actually used it. Then there's Eddy Cue, senior VP of Internet Services, who rarely posts and usually only about the lousy music he's listening to (Lady Gaga? Really?).

But many other employee Twitter accounts provide insight into what it's like to work at the company, offer tips for job openings and shed some light on how Apple's employees feel about rivals.

Philip Schiller, Senior VP of Worldwide Marketing

Why: Schiller doesn't tweet much about Apple, but he is one of the highest-ranking employees who actually uses Twitter, and every once in a while you get a nugget like this response to another user about his relationship with Steve Jobs.